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Can not control heat in 2008 pt crusier

Only the defrost works the nob will not change the heat to floor or vent '

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  • Expert
  • 159 Answers

Verify may be disconnected under dash

Posted on Dec 28, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

junkman1249
  • 552 Answers

SOURCE: heat only blows out of dash vents, will not blow out of defroster

vvacum leak. in back of your temp control unit there is a series of vaum lines attached together they might even be in different colors these lines go to the vent and they open and close them when you slide the lever over this piece needs to be replaced

Posted on Dec 05, 2008

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

chuck943
  • 783 Answers

SOURCE: Vent control

You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

Posted on Mar 02, 2009

  • 19 Answers

SOURCE: How can I locate the blend door for the heater/defroster

you have a bad control switch.

Posted on Mar 05, 2009

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

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1 Answer

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A/c and heat dash vents won't work but all others are fine


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2008 Nissan xterra with heat stuck on. My dash got taken apart for a cd deck change and the controls for my heater/ac system got unplugged and plugged during the process. Now the only control in the set...


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May 12, 2014 | Cars & Trucks

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2008 jeep liberty vents not blowing out air?


I also have an 08 liberty, but my issue is that the heat won't blow out on the floor....the air vents and defrosters work great. You can hear it trying to switch over but doesn't. You need a new Air Flap Actuator (16-$30) The real issue is that you have to take offf the whole das in order to fix it. That is abouy 9 hours worth of work.

Oct 08, 2012 | 2008 Jeep Liberty

1 Answer

Ac vents not working


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Jun 13, 2012 | 2007 Ford Sport Trac Limited

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HEAT DOESN'T COME OUT OF VENTS,JUST DEFROST & FLOOR


their is a flap inside of the vents that is not being turned. so the cable connecting the heater nob to flap might be disconected. or the flap is broken

May 18, 2011 | Jeep Grand Cherokee Cars & Trucks

2 Answers

Heater only blow out the vents


There are servos that move air control gates, some were controlled electrically, and some were vacuum. It sounds like there's a vacuum line off the vacuum reservoir under the hood, or a vacuum line has came off one of the servo diaphragms.

Dec 16, 2008 | 2005 Pontiac Sunfire

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